Originally Posted by mark_k
I think the issue with Double Dragon II was with the ECS Agnus chip rather than the Kickstart version. It's just that most Kickstart 1.3 A500s seem to have the ECS Agnus, even though that wasn't advertised at the time.
Some old D.O.C. Soundtracker version required Kickstart 1.2. It jumped directly to absolute addresses in ROM for the keyboard-handling routine if I remember correctly.
You're probably right about that.